Re: [PATCH 4/4, v2] x86: enlightenment for ticket spin locks - improve yield behavior on Xen

From: Jan Beulich
Date: Wed Jun 30 2010 - 04:48:59 EST

>>> On 30.06.10 at 10:11, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Tue, 2010-06-29 at 15:35 +0100, Jan Beulich wrote:
>> The (only) additional overhead this introduces for native execution is
>> the writing of the owning CPU in the lock acquire paths.
> Uhm, and growing the size of spinlock_t to 6 (or 8 bytes when aligned)
> bytes when NR_CPUS>256.

Indeed, I should have mentioned that. Will do so in an eventual
next version.


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